Erasing apparatus



March 19, 1929. SIMONSENV 1,705,788

ERASING APPARATUS Filed April 7, 1927 Elma H01,

Fatented Mar. 19, 1929. v

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mmsme APPARATUS.

'- Application meaa riia,

This invention relates to an erasing apparatus, and has for one; ofits objects to provide a novel, simple, durable and inexpensive apparatus of this character through the rotated at a rapidrate.

With the foregoingand other objects in view, the nature of which will become apparent as the description proceeds, the invention consists of the construction, com bination and arrangement of parts hereinafter fully described'and claimed, and illus trated in the accompanying drawing, whereing apparatus,

Figure 2 is a top plan view of the erasing apparatus, and j Figure 3 is a sectional View taken on the plane indicated by the line 33 of Figure 2. Theerasing apparatus comprises an open frame 1 which is preferably of elongated rectangular formation and is provided in the end members orbars 2 and 3 thereof with lower bearings 4t and 5 and upper bearings 6 and 7. The bearings 4, 6 and 7 are in theform of sockets which open out through theinner sides of the bars 2 and 3, and the bearing 5 is in the form of an opening which extends through the inner and outer sides of the bar 3, A shaft 8is journaled in the bearings 4 and 5, and a shaft 9 is journaled in the bearings 6 and 7 The bearing 4' and a col-V lar 10, which latter is formed on the shaft 8 and contacts with the inner side of the bar 3, holds the shaft against endwise play in the frame 1, the shaft 9 being held against endwise play by its bearings 6 and 7. The shaft 8'is hollow and constitutes a holder for an eraser 11. The shaft 8 projects outwardly or forwardly beyond the bar 8, and the projecting end thereof is slotted to provide spring jaws 12 which normally stand away from or, occupy an inactive position with respect to the eraser 11. 5A ring 13 which is mounted on the spring jaws 12 holds them in compressed or active position with respect to the eraser 11 so as to hold the eraser against casual endwise and rotative movements with respect to the shaft 8. The spring jaws 12 are provided with arcuated forward ends 12 on which the compressing ring 13 is positioned and which hold the ring'against Figure 1 is an elevational view of the eras- 1927. Serial No. 181,809.

casual movement in an axial direction with I respectto'the clamping jaws112.e The rear ward end ofthe shaft 8 isreduced as shown at 89;, and fi'xedto said end thereof is a pinion 14-. A gear 15 is fixed to the. rear end of the'shaft 9 and meshes with the pinion 14, and a knurled knob or wheel 16 is secured to the forward end of this shaft. In practice the apparatus is used in connection with an erasing shield, and is supported in a manner to hold the forward end of the eraser 11 in contact with-that portion of the drawing which is to be erased. The knob 16 is then turned-with the result that the eraser 11 will be rotated at a rapid rate.

All parts of the apparatus, with the exception of the eraser 11, are made of-metal. The spring jaws 12 and the compressing ring, 13 constitute a chuck'which holds the eraser 11 in the holder 8. If desired the apparatus may be used for the purpose of supporting and operating any tool the action of which requires rapid rotation.

It should be understood that the drawing is merely illustrative and does not pretend to give exact proportions. Furthermore, the said drawing is illustrative of a preferred construction, it being my expectation that varlous changes and modlfications may be made without departing from the spirit and scope of my invention.

What is claimed is 1. A device of the character set forth, comprising an open frame, a hollow shaft rotatably mounted on the frame and provided with a chuck,a second shaft rotatably mounted on the frame in parallel relation to said first shaft, meshing gears fixed to the shafts, and an operating member secured to the second shaft and accessible through the open sides of the frame. a e a 2. A device of the character set forth, comprising an open frame having its end members provided with alined bearing sockets and with an alined bearing socket and bearing opening, a shaft j ournaled in the alined bearing sockets, a hollow shaft journaled in the alined bearing socket and bearing, opening and having an end thereof projecting beyond the frame member provided with the bearing opening, a chuck carried by said end of the hollow shaft, a collar carriedby the hollow shaft and contacting with the inner side of the frame member provided with the bearing opening, meshing gears fixed to the shafts, and a knob carried by said first shaft and accessihle through the open sides of the frame.

. mounted on said jaws to hold them engaged with said bar of erasing material, the other end of said shaft having a reduced extension, the frame provided With'a socket journaling said extension, a second shaft arranged parallel with. the hollow shaft and journaled within the frame, gearing connecting the two shafts, and a knurled Wheel secured to the last mentioned shaftfor manual operation of the shafts, said knurled Wheel being larger in diameter than the Width of the sides of the frame.

In testimony whereof I affix my signature.

ERNEST J SIMONSEN. 

